One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(7,8)(11,12)(21,22)(23,29)(24,26)(25,32)(27,31)(28,33)(30,34)(35,36) involution — undirected(5,6,10,9)(7,12,8,11)(13,14,17,16)(15,19,20,18)(22,24)(27,29)(28,32)(34,35)(5,7,10,8)(6,11,9,12)(13,15,17,20)(14,18,16,19)(21,23,26,31)(22,27,24,29)(25,30,33,36)(28,34,32,35)(1,2)(3,4)(5,8,10,7)(6,12,9,11)(21,24,26,22)(23,27,31,29)(25,32,33,28)(30,34,36,35)(5,9,10,6)(7,12,8,11)(13,16,17,14)(15,19,20,18)(21,25,26,33)(22,28,24,32)(23,30,31,36)(27,34,29,35)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.